The 'LP' examples shows the various Low Power modes supported
by the MAX32660 family of devices.

Configuration:
 - To wake using the push button
   - Set #define USE_BUTTON 1
 - To wake using the RTC
   - Set #define USE_BUTTON 0

Functionality:
 - Iterates through the various low power modes, using either the RTC
   alarm or a GPIO to wake from each.

 - The wakeup source is a compile time definition using a #DEFINE to
   determine which wakeup source to use.
 - With the application running, measure the current used on the VCORE rail.

 - The power states shown are:
   1. Active mode power with all clocks on
   2. Active mode power with peripheral clocks disabled
   3. Active mode power with unused RAMs in light sleep mode
   4. Active mode power with unused RAMS shut down
   5. SLEEP mode
   6. BACKGROUND mode
   7. DEEPSLEEP mode
   8. BACKUP mode
